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Organization and Description of Business (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Organization and Description of Business    
Cash and cash equivalents $ 7,235 $ 6,451
Short-term held-to-maturity investments 0 2,606
Gross proceeds to date 91,000  
(Losses) since inception $ 92,762 $ 88,523